Loud-speaker horn



June 4, 1929. w. N. HUNTER LOUD SPEAKER HORN Filed April 23. 1925 Patented June 4, 1929.

UNITED STA WILLIAM N. HUNTER, OF BLANCHESTER, HIO.. v

LOUD-SPEAKER HORN.

Application filed April 23, 1925. Serial No. 25,408.

My invention relates to loud speaker horns.

It is my object to provide a horn which may be conveniently mounted on a microphone receiver and which will in a large measure eliminate the reverberations due to static and other rough and vibrant tones emitted from the microphone receiver.

Specifically it is my object to provide, in that novel construction hereinafter described and claimed, for an air insulated passage through which the sound waves shall 'be passed prior to their entry into the horn delivering end of the device. It is further my object to provide an adjustable member within the horn by which any volume of sound may be controlled.

Referring to the drawings in which I have illustrated my preferred structure:

Figure 1 is a vertical section through the horn and sound passage.

Figure 2 is a vertical section on a slightly enlarged scale of the sound passage shown in Figure 1 as indicated by the lines 22.

Generally indicated at 1 is the bell shaped horn in which the bent tube 2 is disposed.

As shown the tube is secured to a sleeve 3 on a flange 4 formed in the side walls of the horn where it may be slightly retained on the sleeve. The inner end of the tube is provided with a sleeve 5 which is slidably retained by an adjustment rod 6 which is rotatably mounted in a spider 7 which carries the sleeve so that an opening 8 and air space is provided between the sleeve and the inner portion of the horn. The adjustment rod is threaded in a boss 9 at the corner of the bend in the tube and a wing nut 10 is adjustably mounted thereon so that by turning the wing nut the sleeve may be advanced to regulate the air passage between the end of the sleeve and the inner wall of the horn.

The flanged portion may be utilized for internally retaining the insulated air chamber tube and the bent tube extended as at 11 to form a shoulder to limit the inner movement of the air tube. The air chamber generally indicated at 12 has a lower portion shaped like a T. A tube 13, which is flanged outwardly at the bottom of the chamber, is extended within an outer passage portion 14 in an upward direction where it leads into another tube 15 at right angles to it and to the air passage chamber. The sound waves thus pass from the diaphragm in the receiver microphone through the tube as far as the right angled T portion. It is thought that all vibrant sounds and static are allowed to escape atthis point. An opening 16 between the outer wall of the passage and this tube extends about the T portion and into the main air passage indicated at 17. The walls 18 of the main air passage tube may be of wood with top and bottom metal portions into which the walls may be secured or as shown the entire insulated passage member may be formed from an integral piece of metal or composition material.

I have found it preferable, though not essential, to secure in the top portion of the air passage tube extending across the passage member and secured in slots a rod 19 with a fine wire shaped as a spring 20 secured to the rod and to mount the spring between the rod, as noted, and the upper portion of the T within the air chamber.

As will be clearly understood the bottom walls 14 of the passage member are adapted to seat within the sound aperture in a receiver microphone with the flanged portion of the tube 13 in close proximity but not touching the sound diaphragm.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. Aloud speaker horn having a horn and a tubular walled air passage element through which sound waves pass to the horn element, said tubular element having a hollow T therein with an opening therein facing the direction from which the sound waves are emitted, said T element having branch passages extending through the walls of the tube and opening exteriorly thereof.

2. A loud speaker horn having a horn and a tubular walled air passage element through which sound waves pass to the horn element, said tubular element having a hollow T therein with an opening therein facing the direction from which the sound waves are emitted, said T element having branch passages extending through the walls of the tube and opening exteriorly thereof, said tubular element extending within the horn, with the opening thereof facing the apex of the horn, thereby providing an air space bet-ween said tube and the walls of the horn.

3. A loud speaker horn having a horn and a tubular walled air passage element through which sound waves pass to the horn element, sa1d tubular elementhaving a hollow T therein with an opening therein facing the direction from which the sound Waves are emitted, said T element having branch passages extending through the Walls of the tube and opening exterior-1y thereof, said tubular element extending Within the horn, With the opening thereof facing the apex of the horn,

thereby providing an air space between said tube and the Walls of the horn, and means for regulating the size of the air space be- 10 tween the end of the tube and the inner Walls of the horn.

WILLIAM N. HUNTER. 

